Overview on Leakage Current Reduction Methods in Single-Phase Grid-Connected Inverters

Ground leakage currents can occur in transformerless grid-connected photovoltaic inverter systems, posing safety and performance issues. This paper provides a brief overview of recent research efforts focused on reducing or eliminating ground leakage currents in transformerless grid-connected single-phase voltage source inverters. The main objective of this study is to examine and describe the various methods used, including modifications or proposals for topologies, switching schemes, and filters. The paper aims at offering insights into the progress made to address the problem of ground leakage currents and their mitigation strategies in transformerless grid-connected PV inverters.